docs: def model_m2m_changed(sender, instance, action, **kwargs):
      """
      Signal emitted after any M2M relation changes via Django ORM.
  
      :param sender: M2M intermediate model
      :param instance: The actual instance that was saved
      :param action: M2M action
      """
  
      if sender._meta.app_label == 'rest_framework_reactive':
          # Ignore own events.
          return
  
      def notify():
          table = sender._meta.db_table
          if action == 'post_add':
              notify_observers(table, ORM_NOTIFY_KIND_CREATE)
          elif action in ('post_remove', 'post_clear'):
              notify_observers(table, ORM_NOTIFY_KIND_DELETE)
  
      transaction.on_commit(notify)